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H. LANDSIEDEL.

KEY CONTROL MECHANISM FOR ADDING MACHINES May 12, 1925.

Filed Sept. 7. 1922 5 Sheets-Sheet 1 May 12, 1925.

H. LANDSIEDEL KEY CONTROL MECHANISM FOR ADDING MACHINES Filed Sept. 7. 1922 5 Sheets-Sheet 2 INVENTOR rry Land 1846?,

ATTORNE 3."

May 12, 1925.

. H. LANDSIEDEL KEY common mncmmrsu FOR ADDING 'mmcmuzs Filed Se t. 2. 1922 5 she'at'-Sheet 5.

INVENTOR I5 2y lidfldje'eaei, w By ATTORNEY;

1,53%,314 LANDSlEDEL KEY CONTROL MECHANISM FOR ADDING MACHINES Filed 5615i. 7. 1922 5 ShetS-Sheet 4 I Mair; E 1

[N VENTOR jar/'51 J 0770'j19d92 5W dam ATTORNE May 12, 1925 1,537,314

H. LANDSFEDEL KEY CONTROL MECHANISM FOR ADDING MACRINES Filed Sept. 7. 1922 5 Sheets-Sheet 5 A TIORA/E V6 I I -.Be it knownthat'I, HARnr-LANnsmnEL, a

Q Patented May 12 UNITE-D11STATES.

PATEN-Ij-OFFICE.

nanny or cmonmar'i onro. ASSIGNOR T DALTON Ammo aia'cnmrg 'coma w,'or cmcrmgrnrnonro, a conrona'rron or 01110.

11mm roaalanine macirnmsil pplication September 1 V citiman of-the United :States,'-residing at n-(lincinnati 'inlthe county of ;Hamilton and a State of -Ohio",- have i-invented certain new 41nd useful Improvements in Key-Control Mechanism-fort Adding Machines, of which lhevfollowing aspgecification. -.Theob]'ectof; this invention is provide means to .insure =the pro r functioning of i {as the "numeral key p r; comstionik-eyl specia l keyslwhicbmay be used in"conjuncthexcustom-in adding machine construction V -to provide locksto control the various keys against depression when the operating le- 'ver is in a fomvard'positiomand the ordinary method is to furnish an individual lock foreacl1- key.-} In the present invention, all

, of the." keys,- including thenmneral keys,

are con'trolle'dhy one locking member, thereby eliminating numerousparts and; oomph cations. r

'Anotherohject of the invention is topro: videfme'ansfor latchin down the feature keys, such as the total, su total, subtraction, and non-add keys, so that it is unnecessary 3 to hold the selected I in g the lever.

key down while operat- Anotherfeature of the resent invention pertains to-the provision o a ke known as a release key which may be emp oyed to re- -3 store any key that was accidelntally or inadvertently depressed, and a f rther object is to prevent the machine from being operated if any key is partially or ancorrectlydcpressed. v 4 A still further object is toprevent an opcrntor from restoring the keys that have been depressed to their normal position afteiuthc operating lever is started forward, and also to prevent the depression of the variouskeys after the operating lever has heenpartially pulled forward. These andother improvements are made possible 'by this device which will be called hereinafter the universal key control mechanism.

The accompanying drawings illustrate that its use i s not -restrictedf "t s PiFi larfmake of machine. Inthe drawings, only so much of a comerative relation .to the various keysffiem-f ployed, and it will be understood frbilji' the present description that the special keys to be hereinafterreferred ,to'are desfcribed by: way of illustration of the capacitiesof the control mechanism and that. it islnot D Y .the intention to limit the-invention. to the tion with the-regular numeral -keys;' It.1'si

useof the particular special keys indicated,

sinceit. is evident that additional 5 cial' keys of like or similar character ymig it be used 'or that the particular keys hereinafter struction of the key itselfor its mode of,

co-operation with 'the control .inechanism.

' From theabove it will be evident that the name hereinafter" given to any particular key is to be merely employed for purposes" of convenient description and that the same or other like key might be employed to control other portions of the mechanism without substantialtchzmge ormodification.

In the drawings:

Figure i is a side elevation-of a Dalton adding machine showingonly so much oi the interior mechanism as is needful for' a correct understanding of the present invention; a

' Fig. 2 is a fi'ontclevation of the machine, partially broken away to better illustrate the key control mechanism and associated parts; i v

Fig. 3 a side elevation of the key c0ntrol mechanism with the back space key and subtraction key at the ertreme right'of the machine remo\-'ed to better illustrate the remaining mechanisms;

Fig. 4 is a similar view showing the relaiion of the parts wi keys depressed; v

Fig. 5 is a similar View showing theta-ta! keys depressed; Fig.6 is a view showing in normal asi- (h one of the numeral.

tion the mechanism for latching down the feature keys that are to remain depressed the total key during the operation of the machine;

Fig. 7 is a similar view showing the same mechanism in the position it assumes when orany feature key is depressed; i

Fig. 8 is a view similar to. Fig. 7 except that :the mechanisms are, illustrated in the gosition assumed when the operating hanleis moved to its extreme forward position which releases the latch and thereafter permits all parts to be restored to normal po- "sition.

Fig. 9-is a front view of the key bank and associated parts; and Fig. 10 is a detail of the subtraction-key and associated parts.

The features of the invention, as shown, are' embodied in an adding machine of the Dalton type which is provided near its upper'rear portion with a transversely extending rock shaft 1 which supports a series of the .type carriers 2 of arcuate formation together occupy the usual position at the front of the machine and range from zero to nine inclu sive. The 'numeral keysare mounted upon the upturned forwards ends of key levers 7 which are fulcrumed in the usual manner at oint 71 (see Fig. 1), and each of the key evers,operates against the tension of a spring 10 and-at its rearend is provided with an upturned tappet'8 for the purpose of positioning the various stops 9 in the transversely movable carriage 10. The usual main operating shaft 11, which oarriesthe handle, is provided with a full stroke sector 12 which co-acts with a full strokepawl 13, so that a partial forwardmovement of the handle and shaft will be prevented. 'All of the above mechanisms are-well understood in the art and. need not be refcrredto in more complete detail. I

he parts now to be: described 2 more directly to the key control mec anism of the present invention. -At a poi slightly in advance of the main operatiiig shaft, is located a transversely extending rock shaft 14 which is journaled'a't its left end in the side frame 15 of the casing and is journaled at its right end in an upstanding bracket 16 secured to the base of the frame as best shown in Fig. 2. Rigidly pinned to the rock shaft 14 are a pair-of L-shaped arms 17 and ertain 18 near the left and right ends respectively of the shaft, and the forward extensions of these arms serve to carry and support a cross bar 18' which, with its supports, constitutes a swinging bail which will be raised and lowered by a rocking movement of the shaft 14. g

Rigidly secured to the left end of the shaft 14; and movable therewith, is: an arm 19 which carries at its upper end a roller 20 which works in a cam slot 21 in the forward end of a universal awl lever 22 fulcgumed upon a stud 23 whic extends inwardly from the side frame 15 of the machine. The rear end of the pawl 22 is provided with a roller 24 co-operating with a segment 25 mounted upon the main. operating shaft 11 and rocking therewith. o

Riveted to the forward upper 'corner of the segment 25 is a. sto block 26 which, as shown in Fig.,3, norma y lies below the roller 24 and in position to sweep under said roller with the parts in the position indi cated. When, however, the roller 24 is deaif pressed as indicated in Fig. 4, the stop block 1 26 will abut directly against the rear end of the control pawl lever 22 and prevent any rocking movement of the segment 25, and

thereby prevent movement of'the operating handle.-

The'control mechanism, when actuated by the numeral'keys, is designed tothrow the control pawl-lever 22 ,into the stop ing position indicated in Fig. 14,- and the unction; I in of the numeral keysin this connection' wi 1 now be described. In Fig. 3 it will be observed that each of the numeral key rest directly, upon the control bar or shaft 14 rocked accordingly which oscillates the arm 19 and carries t e roller 20 within levers 5 ail 1 swhen in ,elevated position. When any nu: -rneral ke lever is depressed as indicated in Fig. 4, t bail will be carried down and the the cam slot 21 into the intermediate position indicated in Fig. 4. A movement of this ex} tent results in a swinging down of the control pawl 22 into the stopping position indicated from which it is evident that when a numeral key lever is de 'ressed, the handle cannot be operated until the key lever is again released and the parts restored .to normal'position. f

The machine is provided with the usual correction key to enable the movable stop carriage to be restored to its normal position in case an error is made when de ressing any one of the numeral keys. 'As pyn in Fig 4, the correction key lever 27, of tiifcuate form, is pivoted upon the rod or shaft Y and terminates in a convenient positio' to be operated from the front of the rnac inc The lower portion of the lever 2T i'provid-" ed with a cam face 29 which is adaptedto contact a roller 30 which is'mounted upon the side of a stub key -59 fixed to shaft14 log which acts as a part of the bail mechanism,

so that when the correction key is depressed,

the cam face 29 will move the bail down and I the universal pawl 22 will take the position indicated in F ig.-4, locking the main shaft and operating handle against movement until the correction key is restored to'its normal ositionby' the action of a spring 28 (see ig. 4), which connects the correction lever 27 with any suitable fixed portion of the structure.

A back space key lever 31 is pivoted on a I. stud 32 inwardly extending from the right thatithe numeral keys, the back space key,

and the correction key, must be restoredto their normal positions after being depressed wise operated.

and thcrcb complete theirrespective functions and t mt the machine cannot be other- --Attention is now directed to those keys which are designed to remain depressed duringthe operation of the machine. A- total shaft 33 is journaled atits ends by the two main side frames. .Rigidly mounted on the right handof said shaft is a total key lever 34 operating against the tension of a spring 34" and to the left-of the total key' lever, and likewise ri idly pinned to'the total shaft 33 is a depen ing arm 35 provided at its 'lower .end'with aninturned car 36 which normally occupies" if position, as' shown in Fig. 3, closely adjacent a sIot.37 formed in.-t he-rear upper; ortibn of the L-shaped arm lg sothat w eri the total key is depressed, it will directly engage with the slotted portion of the'arm 18 and thereafter swing the arm forwardly depressing the bail to'the; extreme position indicated in Fi 5. -In this casmhowever, the bail bar is given a greater movement than when operated by theJteys which must be restored to their normal position before the machine is operated. This additional movemcntcauses the roller 20 to move to the extreme lowerend of f the cam slot 21 and the lower half of this movement, reverses the effect of the initial movement on the control pawl .22,that is tosay, the rear upper end of the control pawl after being initially depressed is afte'rwards lifted into the position indiczted in Fig. '5, so that the segment 25 on the \andle operated shaft 11 willlbe free to advance to the. osition indicated in dotted lines. During t llS movement, however, the bail and. associated parts .will be maintained in the depressed position indicated and'this will sci-veto hold'the total key leyer in its re- The subtotal key lever 34 is freely mounted upon the shaft 33 and is intended when operated to act against the total key lever v and carry the same back with it, so that the subtotal key lever merely functions through the total key lever inso far as the operation of the universal control bail is concerned.

Pivoted on the shaft 33 is the subtraction key 38 (see Fig.- 9) which i s.of generally U-shape and is provided on its under edge with a cam face proximate relation to the universalba'il em-"18, so that when the subtraction key is depressed, the canrface will move thebail bar 18* downin the same manner and to thesame extent as during the operation "of the total key which will.

result in the maintenance ofthe. subtraction key in its depressed eration ofthe handle.

the feature keys that are to remain depressed during the operation of the machine is to havetheni latch down when depressed by the operator. To accomplish this a latching position'during the o The most satisfactory way of controlling device is provided to latch the universal bail down' when any such key is depressed. This relieves the operator from the necessity of holding down the key after depression and untilthe handle is initiall pulled. The latching device 40 is particu arly illustrated in Figs. 6, 7"and .-8. The latch is in the form of a depending doubly curved bar which is 'pivoted'to the shaft 33 and normally occupies the'position indicated iii Fig. 6 in which its acting lowerend lies infront of and kabove the" plane of the bail bar 18.

taining latch 40 has alinger 40'. which norma'lly engages the latch 40 and holds thesame in thje position shown in Fig. (3 until 7 depressed by the lowering of the bail 18 which carries down the retaining latch into the position shown in Fig. 7. Integral with the latch 40 is an upper extension nu-lnbcr 41 which is acted upon by a spring 42 secured to some convenient portion of the structure, which spring will cause the lower or acting end of the latch to move reanvardly when released to occupy a position imme- .diately above the bail bar, as shown in Fig. 7. Mounted on the front panel 42 is a release key 43' riveted into a flexible spring arm 44 secured at its lower end at the point 45, so thatwhen the key 43 is'depressed, its inner endwill bear against the forward end of the extension 41 and carry the same back A reto move the latch 40 from its stopping posico-a'cts with a square stub 48 laterally ex- 1 prevents-return movement'thereof.

i 1 scribed 8111112 8 7 gamection' witliilthe tending from the latch 40 near the actin end thereof.- When any key is depresse that is intended to remam down durum the v operation of the machine, the universal bail 6 the full movement and the lower portion of tlie .latch- 40 will .be released by I thefinger 40fland swung rearwardly by the action of the s ring 42 until-it swings over and engages with a stud '49 carried bythe -1 0 arm- 18,'and' the latch will. then hold bail down and the bail will hold the depifessed keydown until. the main oper- 1 atmg shaft llreaches the end of its forward movement at which time a spin ing cross l bar'50 carried by the shaft 11 Will contact inwardly extending heel 51' rigid with the'latch fo'rcethe latch forward into the, releasing position indicated in Fig. 8,.

' In which position the latch ivill be held by .The universal "controls bail hasbeen do a in fmovementin conkeys that remain down the operation of the machine and a l movement with the balance of, the

.jdurin it eysq This latter movement is resisted by .the action'of an arm 52 which is pivoted at the oint 53 in a. slot in the base plate ahd j gui ed by a slot in the cross plate 55. The arm 52 has securedto its rear end a spring 56 for holding'igjpfraised'or normal position, permitting 'fiaficie'nt clearance between the yielding arm the bail bar for the latter to move when -the numeral keys are Q operated without moving the yielding arm 52, but when any key is depressed that is to ,remain down during the operation of the machine,'the increased depression of .the bail will engage the arm 52 and cause it to bedepressed against sprin tension. The usual key locks 58 are pivoted on the plate intermediate the key levers to prevent two humeral keys from .bein depressed at one time and in addition to t is" the'stub key 59 is pivoted on the shaft 14 rind is guided in one of the-slots in the late-55' and co-acts with the key locks in t 1e usual manner.

When the total, sub-tota or back space key is depressed, the 0 stub key 59 moves down and spreads the lbcks 58 thereby preventing-any other; key from being depressed. Since the stub key moves onl in conformity with .the moxements of t e total orsub-total key, it is impossible for the stub key to pass down into its slot when. any of the keys on the keyboard are depressed in position to spread the key locks, and this arrangement prevents the total or subtotal key from being depressed when a digit or other key on the key-board is down.

The shaftfit)" (Fig. 1) supportsthe electric motor operating lever 61 and alsso has theaction of the-.pawl.46 which will engagewith the squareistud 48.0nthe latch andrd end of the rigidly secured thereto a detent 62 which 0 crates an arm 63 on a control shaft 64,

' \v 1ich through suitable'connectionscontrols e motor drive clutch the mechanisms described are wholly indeso pendent of the particular formation or arrangement of the setting up mechanism, the printing mechanism, the accumulation mechanisms. and other features usually incorpointed in an adding machine, it is obvious that the control mechanisms herein described may be readily associated'withwari m types of adding and calculating machines which utilize all or a part of the various general and special keys hereinbeforedescribed. 0 It is also evident that the mechanism is one which readily lends itself to use with special keys additionally to or other than those particularly described, so that in claiming the invention, it is not the intention .to limit theclaims with reference to the .s'ecial work performed by each within .the iody of the machine, since keys, similarly mounted, might be utilized for functions other than thoseparticularly enumerated. i I00 I claimz'. r

1. In an adding machine in combination with a main operating shaft and stop devices for restricting the movement thereof; a series of numeral keys,-a universal control device adapted to be moved by the depression of any one of the numeral keys, means actuated thereby ftir adjusting the stop mechanism to stopping position, and a special key adapted when depressed to imp artan excess movemcnt to the universaleontrol mechanism" and thereby move tho'fsto mechanism to a non-stopping positionfisu stantially as de; scribed.

2. In an'adding machine in combination with a main operating shaft and stop'fd'evices for restricting the movement thereof,

a series of numeral keys, 9. universal bail? to be depressed by the depression of any one sail bail is rigidly secured,

adjhst the stop mechanism for preventing underlying all of I key depressed "main-operating ghait, substantially as deo. o. movement of the joperatmg' shaft,

adapted; to impart an :excess of ping position,

of the keys, :2. rock shaftto which the univer= and a stop actusting incmber carried by the rock shaft and adapted when the bail is depressed to movement of the opera 'ting shaft, substantially as-describedj I 4. In an adding machinhlthe combination of amain operating shaft,.'a stop mechauism'associated therewith, a universal bail adapted to be depressed by the depression of anyone of the e'ys, a rock shaftto which thefuniversal-bail is rigidly secured, a stop actuating member carried by the shaft and adapted when; the bail is depressed to the. stopniechanism for. preventing and a special-"key movement to serving to move the bail, said excess movement the stop actuating member to non-stopping position and-to hold the stop during the oscillation of the scribed. I

In an adding machine-thecombination of a main opcratingshaft, a stop segment carried thereby, a stop engaging arm adapt- 0d when in lowered position to engage the carried there y, a stop engaging arni adaptstop segment and cd when in stoppingposition to engage. the revent rotation thereof and adapted when m non stopping position to ride freely upon the stop-segment, a.plurality of numeral key levers, control ineans actuated by the movement of any key lever for moving the stop engaging member to stopping position, and 11 adapted to impart an increased movement to the stop control means for moving the stop substantially as described.

7. In an adding machine the combination of a main operating shaft, 2. stop segment carricdtherebym stop engaging arm adapted when in stopping positi0n-to engage-the stop segment and prevent rotation thereof and adapted when in non-stopping position to ride freely upon the stop segment, a plurality of numeral key levers, control means actuated by the movement of a: key lever m moving the stop engaging member to stopping position, and a special key lever adapted to impart ail-increased movement the numeral keys' -and special key lever- (1 member to non-stopping position,

to the stop control for moving the ,stop engaging member to non-stopping position, aud tor-holding thespeeial key depressed during the oscillation oftheioperating'shait, substantially as described. v 8.- Inan adding-machine the combination of a series of depre'ssiblemuneral ke'ylever's,

a-swinging b fl11- adapted to be'engagedhy any one of s ai d levers, a main operating r shaft, 0. segmenhcarried thereby;'"a pivotally mountedstop'arm having its inner end in position, when lowered toeiigage andsbop said. segment, and when. inraised ornormal position to ride freely "upon said segment,

- and a 1member= movable: with l-thef bail' and \enga the atter ftO "stopping position: whenrthe 'j bail-is dc ressed hybne ofthe numeral keylevers, su stantielly as described.

- -;r- 9.111 an adding-machine thefcombination i g saidq'iivoted stop armiforglowerin'gi f of a series of depressible'numeral key levers,

a swinging bail adapted to be engaged by any one of said levers, 'a main operating shaft, a segment carried thereby, a .pivotally mounted stop arm having its inner end-1n position, when actuated, to engage and stop .said segment, and when. in.normal position to,r1de freely-upon said -segment, and a a member movable" with the bail; and engaging-said pivotedstop arm for moving the latterto stopping position when the bail 'is depressed by oneof the numeral key levers, a special key, connections between the special movement to the latter when the special key is depres'sed,'the excess of movement serving to return the-stop engaging arm to nonkey and the bail for imparting an excess of stopping'position, substantially as described. 10. In an adding machine the combine tion of a ma in operatinglever, stop mecha; n1smsass oc1ated therewith, numeral key levers, a'universel'control member adapted to be engaged-by each of. the numeral key levers and moved to control the she mech anisms, a special key lever adapte to re" maindeprcssed during the movements of the operating shaft, said key lever adapted to impart an excess of. movement to the universal control member and a latch. mechanism adapted to engage the universal control' member when moved to its extreme position, to prevent a premature return of the special key lever, substantially as de scribed.

11. In an adding. machine the oombina'- tion of a main operating lever, stop mechani'sm associated therewith, nhmeral key levers, a universal control member adapted to be engaged by each of the numeral. key levers and moved to control the stop mechanisms', a special key. lever,- adapted to remain depressed during the movements of the operating shaft, said key lever adapted to impartan excess of movement to the universal control member and a latch mechanism ada ted to engage the universal control mem er when moved to its extreme position, to prevent a permature return of the special key lever, and'meansassociated with the operating shaft for releasing the latch at a predetermined point in the movement of the operating shaft, substantially as kcy'levers, and means for ptreventing movement of the operating sha when said control mechanism is moved throughone degree movement andffor permitting the operation of said shaft when said control mechanism is moved through a different degree of movement, substantially as de scribed.

13. In an adding mahine the combination of a main operating shaft, avkey lever adaptedto be restored to normal position before the operation of the operating shaft, a key leveradapted to remain depressed during the-operation of the operatin shaft,

universal control mechanism adapte to be moved .in varying degree by each of said key levers,-means for preventing movement of the operating .shaft when said control mechanism is moved through one degree of movement and for permitting the operation of said shaft when said control mechanism is moved through a different degree of movement, and latch mechanism adapted to engage and latch said control mechanism when in one of its positions of adjustment, sub stantially as described.

14. In an adding machine the combination of a main operating-shaft, a rock shaft, a universal bail bar'rigidly connected with the rock shaft, an arm rigid upon the rock shaft, a pivoted stop control lever provided near one end with a cam slot for engaging said-arm, a stop segment on the operating shaft adapted to engage-the pivoted stop control lever when in. one position and adapted to ride thereunder when in another os1tion,- and a series of-key levers adapted individually to engage the universal bail bar and depress the same'to cause the stop engaging arm to 'move to'stopping position, substantially as described.

15; In an adding machine the combina-- tion of a main operating'shaft, astop so"- ment carried by said shaft, a rock shaft, a universal bail bar carried by; the rock shaft, a. rocking arm carried the rock shaft, a pivoted stopcontrol lever provided with a cam slot engaged by said rocking arm, the formation of the cam being such that when the rockin arm is, imtially rocked 'the stop control ever will be moved to stopping position and thereafterupon a continued movement of the rock arm will be, restored to non-stopping position, and a special key and connections for'imparting to the bail bar the extreme degree 0 movement, substantially as described.

16. In an adding machine the. combination of a main operating shaft, a stop segment carried by said shaft, a rock shaft, v universal bail bar carried by the rock s aft,- a rocking arm carried by the rock shaft, a .pivoted stop control lever provided with a 'cam slot engaged by said rocking arm, the formation of the cam. being .such that when tlj1e=frocking arm zai's f initially rocked,' the stop control lever' 'will be moved to stopping position and thereafter upon a continued movement of the rock arm will be restored to non-stopping position, a special key and connections for imparting .to the bail bar the extreme degree of movement, and a latch bar adapted to engage and hold down the universal bail bar when moved to its extreme position, substantial ly as described.

' HARRY IiANDSIEDEL. 

